// 默认20位
export function genarateUuid () {
  let d = new Date().getTime()
  const mid = 'xxxxxxxxxxxxxxxxxxxx'.replace(/[x]/g, (c) => {
      const r = (d + Math.random() * 16) % 16 | 0
      d = Math.floor(d / 16)
      return (c === 'x' ? r : (r & 0x3 | 0x8)).toString(16)
  })
  
  return `${mid}`
}
